Cut-off governor



UNTTEDA STATES PATENT Trice.

LEVI O. HARRIS, OF CADILLAC, MICHIGAN.

CUT-OFF GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 473,743, dated April26, 1892. Application led May 8, 1891. Serial No. 892.115. (No model.)

T @ZZ whom t may concern.:

Be it known that I, LEVI C. HARRIS, of Cadillac, in the county oflVeXt'ord and State of Michigan, have invented a new and usefulImprovement in Automatic Cut-Off Governors, of which the following is aspecification. The object of my invention is to provide an automaticcut-oft governor for steam-engines designed to secure an economy of fueland the more steady running of the engine; and it consists in thepeculiar construction and arrangement of parts, which I will now proceedto fully describe, reference being had to the accompanying drawings, inwhich- Figure l is a side elevation ofthe governor, showingthe gearingfor connecting it with the main drive-shai t. Fig. 2 is a verticallongitudinal section. Fig. 3 is a vertical transverse section taken online ma: of Fig. 2; and Figs. 4E, 5, and 6 are details of amodification.

In the drawings, A A represent the cylindrical casing having an annularchamber and formed with ports B B B, opening from this annular chamberto the interior. Within this casing there revolves a closely-fittingsleeve D2, having on its periphery bars or valve surfaces D andalternating spaces or openings C. W'ithin this revolving sleeve D2thereoscillates another closely-fitting sleeve E, which has ports or openingsG, corresponding in number and position to the ports B B ofthe case. YThe sleeve D2 has a smaller sleeve D', that eX- tends through atubularbearing J,which forms the head of the outer casing, and this smallersleeve D is rigidly connected to a bevel gearwheel K. The innerconcentric sleeve E has a shaft E2, which extends through the sleeve Dand wheel K and has attached to it outside the wheel K a crank arm S.crank-arm S is connected by a link T to the vertical slide-rod H, whichhas a swiveling connection at its upper end with the ends of thegovernor-levers WV. These governor-levers are fulcrumed in the branchesN at the upper end of a revolving sleeve, which latter turns in abearing O and at its lower end has a bevel-pinion M, that derives motionfrom the bevel gear-wheel K. The bevel-gear K is rotated by abevel-pinion L on the end of a counter-shaft N', which at its other endis geared to the main shaft R bythe bevel or miter wheels P Q.

This

The casing A is fianged at its base and is designed to sit upon thesteam-chest, with which it communicates, and the end of the casing isadapted to receive a coupling, through which it takes steam from asteam-pipe.

The operation of the governor is as follows: Motion being imparted tothe gear-wheel K, it causes the sleeve D D2 to revolve continuously, andits openings C serve as they pass the ports B ot the casing and G of theinner sleeve to admit the steam from the interior of said sleeve to passto the annular chamber around the sleeve and thence to the steamchestbelow. As shown, there are twice as many openings C in the sleeve D2that there are ports B. This is because the engine cuts off twice to onecomplete revolution of the engine-shaft, and if there are three ports incase A and six valves or openings C in sleeve D the engine-shaft willmake three revolutions to one oi' the sleeve D. In other words, dividethe number of openings in sleeve D by two, and that will give the numberof revolutions the engine-shaft will make to one of the sleeve D. actwith the cut-oit E, and the number of these ports may be greater or lessthan those shown.

For the normal operation of the governor the steam passes from the innersleeve to the outer casing through the registering openings G C B, theopenings C traveling continuously in. one direction. Nowifthe machinerystarts to run at too high a speed from being relieved of its work orthrough other cause the governor-balls are lifted in the well-known way,the slide-rod H is forced down, and the crank S is turned and made tothrow the shaft E2 of sleeve E with a rotary adjustment that causes theports G to be thrown more out oft' registration with B, so that theopenings C of the revolving sleeve remain for a shorter time inregistration with ports G and B, or, in other words, cut off steam at anearlier pointin the stroke of the piston. This economizes steam,allowing it to be used expansively in the piston-cylinder, and avoidsthe loss of power, which would otherwise be expended in an acceleratedspeed. When the speed or power falls below the normal, the balls of thegovernor drop again and the inner sleeve E is shifted in the oppositedirection, which causes the ports G C B to enter into coincidence al-The object of the eXtra valves in D is to IOO ways at the same time andremain in coincidence longer.

As a modication of the invention the ports can be placed in the end orends of the case, as shown'in Figs. 4, 5, and 6, thevalves working asdisks or heads, as shown; but the most convenient Way is through theperiphery of the case, as in Figs. 2 and 3.

Having thus described my invention, what I claim as nevi7 is Thecombination of the case A, having a chamber and ports on its innersurface, the revolving sleeve or head D, with openings C and extensionD', the inner sleeve E, with ports G, and shaft E2, passing throughsleeve or head extension D', the gear-Wheel K, attached to extension D',the governor-sleeve N, having pinion M, and the slide-rod II, link T,and crank S, connecting with the oscillating shaft E2, substantially asshown and described.

LEVI O. HARRIS.

Witnesses:

HENRY W. SILL, I. L. OHITTENDEN.

